WO2018214617A1 - 像素电路、显示面板及其驱动方法 - Google Patents
像素电路、显示面板及其驱动方法 Download PDFInfo
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- WO2018214617A1 WO2018214617A1 PCT/CN2018/078838 CN2018078838W WO2018214617A1 WO 2018214617 A1 WO2018214617 A1 WO 2018214617A1 CN 2018078838 W CN2018078838 W CN 2018078838W WO 2018214617 A1 WO2018214617 A1 WO 2018214617A1
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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- G06F3/0412—Digitisers structurally integrated in a display
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
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- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
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- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
Definitions
- Embodiments of the present disclosure relate to a pixel circuit, a display panel, and a driving method thereof.
- the Organic Light Emitting Diode (OLED) display panel has the characteristics of wide viewing angle, high contrast, and fast response. Moreover, the organic light emitting diode display panel has an advantage of higher luminance, lower driving voltage, and the like than the inorganic light emitting display device. Due to the above characteristics and advantages, an organic light emitting diode (OLED) display panel has been widely received by people and can be applied to devices having display functions such as mobile phones, displays, notebook computers, digital cameras, instrumentation, and the like.
- At least one embodiment of the present disclosure provides a pixel circuit including a light emitting element, an illumination control circuit, a touch detection circuit, and a signal line.
- the light-emitting control circuit is electrically connected to the light-emitting element and configured to drive the light-emitting element to emit light;
- the touch detection circuit is configured to sense the intensity of the light incident thereon for determining whether there is a touch action;
- the signal line is configured to be illuminated and controlled
- the input of the circuit is electrically coupled to the output of the touch detection circuit.
- the touch detection circuit includes a photosensitive element configured to convert light incident thereon into a sensing electrical signal.
- the touch detection circuit further includes an amplification circuit configured to amplify a sensing electrical signal output by the photosensitive element to enhance the touch Control the signal-to-noise ratio of the touch electrical signal of the detection circuit.
- the touch detection circuit includes a first transistor, a second transistor, a third transistor, a first capacitor, and a first node; a photosensitive element, wherein a second end of the first transistor is electrically connected to the first node; the amplifying circuit includes the second transistor and the first capacitor, and a control end of the second transistor is electrically connected To the first node, a first end of the second transistor is electrically connected to a first end of the third transistor, and a second end of the second transistor is electrically connected to a second end of the first capacitor a first end of the first capacitor is electrically connected to the first node; a second end of the third transistor is electrically connected to the signal line.
- the light emission control circuit includes a light emission driving circuit, a light emission selection circuit, and a second capacitance.
- An illumination driving circuit configured to drive the light emitting element to emit light; a light emitting selection circuit configured to selectively write a data signal to a control end of the light emitting driving circuit; and a second capacitor configured to store the data signal and maintain the same At the control end of the illumination driving circuit.
- the light emission control circuit further includes a second node;
- the light emission driving circuit includes a fourth transistor, and a control end of the fourth transistor is electrically connected to the a second node, the first end of the fourth transistor is electrically connected to the second end of the light emitting element, and the second end of the fourth transistor is configured to be electrically connected to the first power end;
- the light emitting selection circuit comprises a fifth transistor, a first end of the fifth transistor is electrically connected to the first end of the signal line, a second end of the fifth transistor is electrically connected to the second node; One end is electrically connected to the second node, and the second end of the second capacitor is electrically connected to the second end of the fourth transistor; the first end of the light emitting element is electrically connected to the second power terminal.
- the touch detection circuit includes a first transistor
- the illumination control circuit includes a fourth transistor
- the first transistor is a bottom gate transistor
- the fourth transistor is a top gate type transistor
- the active layers of the first transistor and the fourth transistor are formed in the same layer.
- At least one embodiment of the present disclosure provides a display panel including an array of pixel cells and a write readout selection circuit.
- the at least one pixel unit includes the pixel circuit described above;
- the write readout selection circuit includes a first end, a second end, and a third end, the third end is electrically connected to the signal line of the pixel circuit, and the first end is electrically connected to the data drive
- the second end of the circuit is electrically connectable to the touch drive circuit;
- the write read select circuit is configured to electrically connect the first end to the third end or to electrically connect the second end and the third end.
- the write readout selection circuit is configured to electrically connect the first end and the third end in a display phase to pass the pixel a signal line of the circuit inputs a display data signal to an illumination control circuit of the pixel circuit; the second end and the third end are electrically connected in a photo sensing read phase to be read via a signal line of the pixel circuit a touch electrical signal of the touch detection circuit of the pixel circuit.
- the write readout selection circuit includes a first control transistor and a second control transistor; a first end of the first control transistor is electrically connected to the a signal line of the pixel circuit, the second end of the first control transistor is configured to be electrically connectable to the data driving circuit; the first end of the second control transistor is electrically connected to the signal line of the pixel circuit, the The second end of the second control transistor is configured to be electrically connectable to the touch drive circuit.
- the display panel provided by at least one embodiment of the present disclosure further includes a touch driving circuit and a data driving circuit.
- the second end of the first control transistor is electrically connected to the data driving circuit; the second end of the second control transistor is electrically connected to the touch driving circuit.
- At least one embodiment of the present disclosure provides a display panel further including a voltage selection circuit configured to electrically connect an input end of the touch detection circuit of the pixel circuit to a first input power source or a second input power supply.
- the voltage selection circuit includes a third control transistor and a fourth control transistor; a first end of the third control transistor is electrically connected to the pixel circuit An input end of the touch detection circuit, the second end of the third control transistor is configured to be electrically connected to the first input power; the first end of the fourth control transistor is electrically connected to the touch of the pixel circuit Controlling the input of the detection circuit, the second end of the fourth control transistor is configured to be electrically connectable to the second input power source.
- At least one column of the pixel units includes the pixel circuits of any of claims 1-7 and share the same signal line.
- At least one embodiment of the present disclosure provides a driving method of a display panel, the driving method of the display panel includes: inputting a display data signal to a light emitting control circuit of the pixel circuit via a signal line of the pixel circuit during a display phase to drive the pixel The circuit emits light; and in the light sensing reading stage, the touch electric signal of the touch detection circuit of the pixel circuit is read through the signal line of the pixel circuit to determine whether there is a touch action.
- the display stage further includes a reset phase and a sensing phase; the driving method further includes: in the reset phase, to the pixel circuit Writing a first voltage to an input end of the touch detection circuit; writing a second voltage to an input end of the touch detection circuit of the pixel circuit during the sensing phase, wherein the second voltage is less than the first A voltage.
- FIG. 1 is a schematic block diagram of a pixel circuit according to Embodiment 1 of the present disclosure
- FIG. 2 is an exemplary circuit diagram of the pixel circuit shown in FIG. 1;
- FIG. 3 is an exemplary circuit diagram of a touch detection circuit of the pixel circuit shown in FIG. 1;
- FIG. 4A is an exemplary circuit diagram of an illumination control circuit of the pixel circuit shown in FIG. 1;
- 4B is another exemplary circuit diagram of an illumination control circuit of the pixel circuit shown in FIG. 1;
- FIG. 5 is a schematic diagram of a display panel according to Embodiment 2 of the present disclosure.
- FIG. 6 is an exemplary circuit diagram of the display panel shown in FIG. 5;
- FIG. 7 is an exemplary flowchart of a driving method of a display panel according to Embodiment 3 of the present disclosure.
- FIG. 8 is an exemplary timing chart of the driving method illustrated in FIG. 7; FIG.
- FIG. 9 is an exemplary schematic plan view of a display panel according to Embodiment 4 of the present disclosure.
- Figure 10 is a cross-sectional view of the display panel shown in Figure 9 taken along line A-A'.
- a OLED display panel with a touch function generally uses a capacitive touch technology.
- the OLED display panel based on the capacitive touch technology needs to adopt two independent manufacturing process steps (that is, the capacitive touch substrate fabrication process and the OLED display substrate fabrication process), the process flow and product structure complex.
- the transistor can be divided into N-type and P-type transistors according to the characteristics of the transistor.
- the embodiment of the present disclosure elaborates the technical solution of the present disclosure by taking the transistor as a P-type transistor as an example, but the implementation of the present disclosure.
- the transistor of the example is not limited to a P-type transistor, and one skilled in the art can also implement one or more transistors in the embodiments of the present disclosure by using an N-type transistor according to actual needs. These transistors are, for example, thin film transistors.
- Embodiments of the present disclosure provide a pixel circuit, a display panel, and a driving method thereof, implement a display panel with a touch function, and optimize a structural layout of a pixel circuit and a display panel.
- At least one embodiment of the present disclosure provides a pixel circuit including a light emitting element, an illumination control circuit, a touch detection circuit, and a signal line.
- the light-emitting control circuit is electrically connected to the light-emitting element and configured to drive the light-emitting element to emit light;
- the touch detection circuit is configured to sense the intensity of the light incident thereon for determining whether there is a touch action;
- the signal line is configured to be illuminated and controlled
- the input of the circuit is electrically coupled to the output of the touch detection circuit.
- At least one embodiment of the present disclosure provides a display panel including an array of pixel cells and a write readout selection circuit.
- the at least one pixel unit includes the pixel circuit described above;
- the write readout selection circuit includes a first end, a second end, and a third end, the third end is electrically connected to the signal line of the pixel circuit, and the first end is electrically connected to the data drive
- the second end of the circuit is electrically connectable to the touch drive circuit;
- the write read select circuit is configured to electrically connect the first end to the third end or to electrically connect the second end and the third end.
- At least one embodiment of the present disclosure provides a driving method of a display panel, the driving method of the display panel includes: inputting a display data signal to a light emitting control circuit of the pixel circuit via a signal line of the pixel circuit during a display phase to drive the pixel The circuit emits light; and in the light sensing reading stage, the touch electric signal of the touch detection circuit of the pixel circuit is read through the signal line of the pixel circuit to determine whether there is a touch action.
- FIG. 1 is a schematic block diagram of a pixel circuit 100 according to Embodiment 1 of the present disclosure.
- the pixel circuit 100 may include a light emitting element 110 (for example, the light emitting element EL shown in FIG. 2), an illumination control circuit 120, a touch detection circuit 130, and a signal line 140.
- the specific form of the light-emitting element 110, the light-emitting control circuit 120, and the touch-sensing circuit 130 can be set according to specific application requirements, which is not specifically limited in the embodiment of the present disclosure.
- a pixel circuit 100 provided in Embodiment 1 of the present disclosure may be implemented as a circuit as shown in FIG. 2.
- the light emitting element 110 may be an organic light emitting element, and the organic light emitting element may be, for example, an organic light emitting diode, but embodiments of the present disclosure are not limited thereto.
- the signal line 140 can include a first end 141 and a second end 142, and the signal line 140 (eg, the first end 141 of the signal line) is configured to be coupled to the input 163 of the illumination control circuit 120 and the output of the touch detection circuit 130.
- the terminal 162 is electrically connected (see FIG. 3 and FIG. 4(a), FIG.
- the display data signal can be input to the light emission control circuit 120 via the signal line 140 of the pixel circuit 100 at different time periods, or via the pixel.
- the signal line 140 of the circuit 100 reads the touch electric signal of the touch detection circuit 130 of the pixel circuit 100, thereby optimizing the layout of the pixel circuit 100, saving manufacturing costs, and reducing the operating power consumption of the product.
- touch detection circuit 130 provided by the embodiment of the present disclosure is described in detail below with reference to FIG.
- the touch detection circuit 130 can be configured to sense the intensity of the light incident thereon, and the generated signal can be used to determine whether there is a touch action.
- the touch detection circuit 130 may be configured to determine whether there is a touch action by the intensity of the light emitted by the light-emitting element EL to which the reflection (for example, reflected by a finger or a stylus performing a touch operation) is sensed.
- the touch detection circuit 130 may be further configured to determine whether there is a touch action by sensing the intensity of the ambient light incident thereon.
- the embodiment of the present disclosure configures the touch detection circuit 130 to determine whether there is a touch action by sensing the intensity of the light emitted by the light-emitting element EL reflected thereon.
- Embodiments of the present disclosure are not limited thereto.
- the specific form of the touch detection circuit 130 can be set according to specific application requirements, which is not specifically limited in the embodiment of the present disclosure.
- the touch detection circuit 130 can include a photosensitive element 131 that can be configured to convert light incident thereon into a sensing electrical signal.
- the photosensitive element 131 may include a first transistor T1, and the first transistor T1 may be, for example, a bottom gate type transistor. Since the first transistor T1 has no occlusion above the channel region, the intensity of the light incident thereon can be sensed. And causing a change in the off-state leakage current of the first transistor T1.
- the first transistor T1 may include a first end, a second end, and a control end.
- the first end of the first transistor T1 may be disposed as the input end 161 of the touch detection circuit 130.
- the control terminal of the first transistor T1 may turn on the first end and the second end when receiving the on signal (for example, a low level signal), and the control terminal of the first transistor T1 receives the cutoff signal ( For example, in the case of a high level signal), the first end and the second end can be disconnected.
- the control terminal of the first transistor T1 receives the off signal but there is a voltage difference between the first terminal and the second terminal of the first transistor T1, a leakage current may occur in the first transistor T1, and the drain
- the intensity of the current is increased as the intensity of the light incident on the first transistor T1 is increased, whereby the presence or absence of the touch action can be determined by the strength of the leakage current of the first transistor T1.
- the touch detection circuit 130 is configured to sense the intensity of the light emitted by the light-emitting element EL reflected thereon to determine whether there is a touch action
- the touch detection circuit 130 when there is a touch operation of the pixel circuit 100, for example, for example The occlusion of the finger, the light emitted by the light-emitting element EL is reflected by the finger and is incident on the first transistor T1, so that the light intensity perceived by the first transistor T1 is increased, and the sensing electrical signal obtained by the first transistor T1 is converted (for example) , the current signal) is enhanced.
- the presence of the touch operation at the corresponding position of the pixel circuit 100 and the intensity of the sensing electrical signal outputted by the first transistor T1 can be determined in the case where the intensity of the sensing electrical signal output by the first transistor T1 is greater than a predetermined value.
- the predetermined value is less than or equal to the predetermined value, it is determined that there is no touch operation at the corresponding position of the pixel circuit 100, and thus the display panel including the pixel circuit 100 can implement the touch function.
- the touch detection circuit 130 may further include an amplification circuit 132.
- the amplification circuit 132 may be configured to amplify the sensing electrical signal output by the photosensitive element 131 to improve the signal-to-noise ratio of the touch electrical signal of the touch detection circuit 130.
- the photosensitive circuit may further include a touch selection circuit, and the touch selection circuit may be configured to control the time for reading the touch electrical signal.
- the specific configuration of the touch detection circuit 130 and the touch selection circuit may be set according to specific application requirements, which is not specifically limited in the embodiment of the present disclosure.
- the amplifying circuit 132 may include the second transistor T2 and the first capacitor C1; for example, the touch selection circuit may include the third transistor T3; for example, the second transistor T2 and the third transistor T3 may be top-gate transistors, or It is a bottom gate transistor.
- the touch detection circuit 130 may further include a first node 151.
- the second end of the first transistor T1 can be electrically connected to the first node 151.
- the control terminal of the second transistor T2 may be electrically connected to the first node 151, the first end of the second transistor T2 may be electrically connected to the first end of the third transistor T3, and the second end of the second transistor T2 may be electrically connected. It is to the second end of the first capacitor C1 and is electrically connected to the reference voltage terminal Vref.
- the first end of the first capacitor C1 may be electrically connected to the first node 151, the second end is electrically connected to the reference voltage terminal Vref, and the second end of the third transistor T3 may be electrically connected to the signal line 140 (eg, a signal line) The first end 141).
- the signal line 140 eg, a signal line
- the touch detection circuit 130 can implement the touch detection function by the following steps.
- Step S110 The reset phase is such that the first transistor T1 is in an on state, and the first voltage (reset voltage) is written on the first node 151 via the first end of the first transistor T1.
- Step S120 The sensing phase is such that the first transistor T1 is in an off state and the second voltage is written on the first end of the first transistor T1, the second voltage being less than the first voltage.
- Step S130 The touch electric signal reading phase is such that the third transistor T3 is in the conducting phase, and the electrical signal output by the third transistor T3 is read via the signal line 140.
- a low level signal may be applied to the control terminal of the first transistor T1 to be in an on state, whereby the first voltage may be written in the first via the turned-on first transistor T1.
- On node 151 the voltage written on the first node 151 can be stored in the first capacitor C1, and the first capacitor C1 can hold it at the control terminal of the second transistor T2.
- the first voltage written causes the second transistor T2 to be in an off state.
- the voltages of the control terminal and the second terminal of the second transistor T2 may be the same, that is, the first voltage is equal to the reference voltage Vref, and the lower two are equal.
- a high level signal can be applied to the control terminal of the third transistor T3 to be in an off state.
- a high level signal may be applied to the control terminals of the first transistor T1 and the third transistor T3 to bring the first transistor T1 and the third transistor T3 into an off state.
- the light emitted by the light-emitting element EL is reflected by, for example, a finger, and is incident on the first transistor T1, so the intensity of the light perceived by the first transistor T1 and the leakage current in the first transistor T1.
- the intensity of the increase increases, the amount of charge loss at the first end of the first capacitor C1 increases, and the amount of voltage drop of the first node 151 increases, and until the second transistor T2 becomes conductive from off.
- the second transistor T2 becomes conductive even in the presence of a touch action, since the third transistor T3 is in an off state, there is no on-state current in the second transistor T2.
- a low level signal may be applied to the control terminal of the third transistor T3 to bring the third transistor T3 into an on state.
- the second transistor T2 is in an on state, thereby flowing current from the reference voltage terminal Vref to the signal line 140 via the second transistor T2 and the third transistor T3, whereby the signal line 140 can acquire the touch detection circuit 130.
- Touch electric signal For example, the touch electric signal reading stage further includes a second sensing stage, and the second sensing stage is a time period before the third transistor T3 in the touch electric signal reading stage is turned on.
- the intensity of the touch electrical signal depends on the voltage of the control terminal of the second transistor T2 (that is, the voltage of the first node 151), and the voltage of the control terminal of the second transistor T2 depends on the sensing phase and the second sense.
- the cumulative value (integral value) of the leakage current of the first transistor T1 in the measurement phase that is, depends on the intensity of the light incident on the first transistor T1.
- the voltage of the first node 151 is lower in the presence of a touch action, and thus the on-state current intensity of the second transistor T2 in the touch electric signal reading phase and The intensity of the touch electric signal acquired by the signal line 140 is higher, so that the touch operation can be determined at the corresponding position of the pixel circuit 100 if the intensity of the touch electric signal acquired by the signal line 140 is greater than a predetermined value.
- the predetermined value can be obtained based on experimental measurements.
- the weak off-state leakage current output by the first transistor T1 can be converted into a stronger on-state output of the second transistor T2.
- the current can thereby increase the signal to noise ratio of the touch electrical signal of the touch detection circuit 130.
- the sensing phase and the touch electric signal reading phase can be separated. Therefore, in the case where the touch detecting circuit 130 and the light emitting control circuit 120 share the signal line 140, the sensing can still be performed.
- the phase is set in the display phase, and the intensity and the signal-to-noise ratio of the touch electrical signal are ensured under the premise that the time length of the touch electric signal reading phase is minimized, that is, the pixel provided in the first embodiment of the present disclosure.
- the circuit 100 can ensure or enhance the signal to noise ratio of the touch electrical signal while optimizing the circuit layout.
- the illumination control circuit 120 provided by the embodiment of the present disclosure will be described in detail below with reference to FIG. 1 , FIG. 2 , FIG. 4A and FIG.
- the light emission control circuit 120 may be electrically connected to the light emitting element EL and configured to drive the light emitting element EL to emit light.
- the light emission control circuit 120 may include a light emission driving circuit 121, a light emission selection circuit 122, and a second capacitance 123.
- the light emitting driving circuit 121 may be configured to drive the light emitting element EL to emit light;
- the light emitting selection circuit 122 may be configured to selectively write the data signal to the control end of the light emitting driving circuit 121;
- the second capacitor 123 eg, the second capacitor C2
- the specific form of the light-emitting driving circuit 121, the light-emitting selection circuit 122, and the second capacitor 123 may be set according to specific application requirements, which is not specifically limited in the embodiment of the present disclosure.
- the light emission control circuit 120 can be implemented as a 2T1C circuit that uses two TFTs (Thin-film transistors) and one storage capacitor to drive the light-emitting elements EL (eg, OLEDs) to emit light.
- TFTs Thin-film transistors
- EL light-emitting elements
- Figures 4A and 4B show schematic diagrams of two 2T1C pixel circuits 100, respectively.
- a 2T1C type illumination control circuit 120 may include a fifth transistor T5 (ie, the illumination selection circuit 122), a fourth transistor T4 (ie, the illumination driving circuit 121), and a second capacitor C2.
- the control terminal of the fifth transistor T5 can receive the scan signal
- the first end of the fifth transistor T5 can be electrically connected to the signal line 140 to receive the data signal
- the second end of the fifth transistor T5 can be electrically connected to the second node. 152, that is, the control terminal of the fourth transistor T4.
- the first end of the fourth transistor T4 may be electrically connected to the second end of the light emitting element EL (eg, the positive end of the OLED); the second end of the fourth transistor T4 may be electrically connected to the first power terminal VDD, for example,
- the first power terminal VDD may be a voltage source to output a constant positive voltage, or the first power terminal VDD may also be a current source or the like.
- the first end of the second capacitor C2 is electrically connected to the second node 152 (ie, the second end of the fifth transistor T5 and the control end of the fourth transistor T4), and the second end of the second capacitor C2 is electrically connected to the The second end of the four transistor T4 and the first power terminal VDD; the first end of the light emitting element EL (for example, the negative terminal of the OLED) is electrically connected to the second power terminal VSS, for example, the second power terminal VSS may be a ground terminal.
- the 2T1C pixel circuit 100 controls the brightness and darkness (grayscale) of the pixels using the second capacitor C2 and the two TFTs.
- the data voltage fed through the data line charges the second capacitor C2 via the fifth transistor T5, thereby storing the data voltage In the second capacitor C2, and the stored data voltage can control the conduction degree of the fourth transistor T4, thereby controlling the magnitude of the current flowing through the fourth transistor T4 for driving the OLED to emit light, that is, the current determines The gray level of the pixel illumination.
- another 2T1C type illumination control circuit 120 also includes a fifth transistor T5, a fourth transistor T4, and a second capacitor C2, but the connection manner thereof is slightly changed.
- the variation of the illumination control circuit 120 of FIG. 4B with respect to FIG. 4A includes that the second end of the light emitting element EL (eg, the positive terminal of the OLED) is electrically connected to the first power terminal VDD, and the first of the light emitting elements EL The terminal (eg, the negative terminal of the OLED) is electrically coupled to the second terminal of the fourth transistor T4, and the first terminal of the fourth transistor T4 is electrically coupled to the second power terminal VSS.
- the second end of the second capacitor C2 is connected to the second node 152 (ie, the second end of the fifth transistor T5 and the control end of the fourth transistor T4), and the first end of the second capacitor C2 is connected to the fourth transistor T4.
- the operation mode of the 2T1C type illumination control circuit 120 is substantially the same as that of the pixel circuit 100 shown in FIG. 4A, and details are not described herein again.
- the embodiment of the present disclosure is only described by the illumination control circuit 120 as a 2T1C circuit, but the illumination control circuit 120 of the embodiment of the present disclosure is not limited to the 2T1C circuit.
- the illumination control circuit 120 may also have an electrical compensation function according to specific application requirements.
- the compensation function can be implemented by voltage compensation, current compensation or hybrid compensation.
- the illumination control circuit 120 with compensation function can be, for example, 4T1C, 4T2C, 6T1C, and other illumination control circuits 120 with electrical compensation functions, and details are not described herein again. .
- the illuminating control circuit 120 may further include an external compensation circuit portion, for example, may include a sensing circuit portion to sense the electrical characteristics of the driving transistor or the electrical characteristics of the illuminating element.
- an external compensation circuit portion for example, may include a sensing circuit portion to sense the electrical characteristics of the driving transistor or the electrical characteristics of the illuminating element.
- the transistors used in Embodiment 1 and other embodiments of the present disclosure may be thin film transistors or field effect transistors or other switching devices having the same characteristics.
- the source and drain of the transistor used here can be symmetrical in structure, so the source and drain of the transistor can be physically indistinguishable.
- one of the first end and the other end are directly described, so that all of the embodiments of the present disclosure
- the first and second ends of the partial transistor are interchangeable as needed.
- the first end of the transistor of the embodiment of the present disclosure may be a source, and the second end may be a drain; or the first end of the transistor is a drain and the second end is a source.
- the display panel including the pixel circuit 100 is provided with a touch function; by inputting the signal line 140 and the input end of the illumination control circuit 120 The output of the control detection circuit 130 is electrically connected such that the illumination control circuit 120 and the touch detection circuit 130 can share the signal line 140, whereby the layout of the pixel circuit 100 can be optimized.
- the signal-to-noise ratio of the touch electric signal of the touch detecting circuit 130 can be improved; by setting the touch selecting circuit in the touch detecting circuit 130, The signal-to-noise ratio of the touch electrical signal is guaranteed or improved in the case of optimizing the circuit layout.
- the present embodiment provides a display panel 10.
- the display panel 10 includes an array of pixel units 240 and a write readout selection circuit 210.
- FIG. 5 exemplarily shows three rows and three columns of pixel units 240, but embodiments of the present disclosure are not limited thereto, and for example, according to specific application requirements, the display panel 10 may include 1440 lines, 900 columns of pixel units 240.
- at least one of the pixel units 240 may include any of the pixel circuits provided in the first embodiment.
- a part of the pixels in the display panel 10 may include the pixel circuit provided in the first embodiment.
- one pixel unit per ten pixel units may be included in the first embodiment according to the required touch precision.
- the pixel circuit, or in order to achieve pixel-level touch precision, all of the pixel units 240 of the display panel 10 may include the pixel circuit provided in the first embodiment.
- at least one column of pixel units 240 of the display panel 10 may include the pixel circuits provided in Embodiment 1, and each of the at least one column of pixel units 240 shares the same signal line.
- the write readout selection circuit 210 provided in the second embodiment of the present disclosure will be described in detail below with reference to FIGS. 5 and 6.
- the write readout selection circuit 210 may include a first end 211, a second end 212, and a third end 213, and the third end 213 is electrically connected to the signal line 140 of the pixel circuit, One end 211 can be electrically connected to the data driving circuit 222, and the second end 212 can be electrically connected to the touch driving circuit 221.
- the write read select circuit 210 is configured to electrically connect the first end 211 to the third end 213 or to electrically connect the second end 212 and the third end 213 for corresponding signal transmission.
- the write readout selection circuit 210 may be configured to electrically connect the first end 211 and the third end 213 during the display phase, and at this time, the display data signal may be input to the light emission control circuit of the pixel circuit via the signal line 140 of the pixel circuit;
- the write readout selection circuit 210 can also be configured to electrically connect the second end 212 and the third end 213 during the optical sensing read phase.
- the touch detection circuit of the pixel circuit can be read via the signal line 140 of the pixel circuit. Touch electric signal.
- the specific form of the write-read selection circuit 210 can be set according to specific application requirements, which is not specifically limited in the embodiment of the present disclosure.
- a write readout selection circuit 210 provided in Embodiment 2 of the present disclosure may be implemented as a circuit as shown in FIG. 6.
- the write read select circuit 210 may include a first control transistor CT1 and a second control transistor CT2; the first end of the first control transistor CT1 (ie, the third end 213 of the write read select circuit) is electrically coupled to The signal line 140 of the pixel circuit, the second end of the first control transistor CT1 (ie, the first end 211 of the write read select circuit) is configured to be electrically connectable to the data drive circuit 222; the first of the second control transistor CT2
- the terminal ie, the third terminal 213 of the write read select circuit
- the second terminal of the second control transistor CT2 ie, the second terminal 212 of the write read select circuit It is configured to be electrically connected to the touch driving circuit 221.
- the display panel 10 may further include a touch driving circuit 221 and a data driving circuit 222 according to specific application requirements.
- the second end of the first control transistor CT1 is electrically connected to the data driving circuit 222; the second control transistor CT2 The second end is electrically connected to the touch driving circuit 221.
- the first end 211 of the write read select circuit can be electrically connected to the third end 213 of the write read select circuit by controlling the on and off of the first control transistor CT1 and the second control transistor CT2, or
- the second terminal 212 of the write sense selection circuit is electrically coupled to the third terminal 213 of the write read select circuit, that is, the data can be turned on and off by controlling the first control transistor CT1 and the second control transistor CT2.
- the driving circuit 222 is electrically connected to the signal line 140 of the pixel circuit or electrically connects the touch driving circuit 221 to the signal line 140 of the pixel circuit. Therefore, the data driving circuit 222 can input a display data signal to the light emitting control circuit of the pixel circuit via the signal line 140 of the pixel circuit during the display phase; the touch driving circuit 221 can be read through the signal line 140 of the pixel circuit during the light sensing reading phase.
- the light emission control circuit and the touch detection circuit of the pixel circuit of the display panel 10 provided in the second embodiment of the present disclosure can share the signal line 140, thereby optimizing the layout of the pixel circuit and the display panel 10.
- the touch driving circuit 221 and the data driving circuit 222 can be implemented in various forms. For example, the two can be implemented by using a single semiconductor chip, or by using the same semiconductor chip, or by using an FPGA circuit or the like.
- display panel 10 may also include voltage selection circuit 230.
- the write readout selection circuit 210 provided in the second embodiment of the present disclosure will be described in detail below with reference to FIGS. 5 and 6.
- voltage selection circuit 230 can be configured to electrically connect input 161 of the touch detection circuitry of the pixel circuit (eg, the first end of the first transistor) to first input power source Vref or second input power source Vini.
- the specific form of the voltage selection circuit 230 can be set according to specific application requirements, and the embodiment of the present disclosure does not specifically limit this.
- a voltage selection circuit 230 provided in Embodiment 2 of the present disclosure may be implemented as a circuit as shown in FIG. 6.
- the voltage selection circuit 230 may include a third control transistor CT3 and a fourth control transistor CT4; the first end of the third control transistor CT3 is electrically connected to the input end 161 of the touch detection circuit of the pixel circuit, The second end of the third control transistor CT3 is configured to be electrically connected to the first input power source Vref; the first end of the fourth control transistor CT4 is electrically connected to the input end 161 of the touch detection circuit of the pixel circuit, and the fourth control transistor CT4 The second end is configured to be electrically connectable to the second input power source Vini.
- the first input power source Vref and the second input power source Vini may be voltage sources, and the intensity of the first voltage output by the first input power source Vref may be greater than the intensity of the second voltage output by the second input power source Vini.
- the third control transistor CT3 is turned on and the fourth control transistor CT4 is turned off
- the first voltage can be written to the input end 161 of the touch detection circuit of the pixel circuit (for example, the first end of the first transistor)
- the third control transistor CT3 is turned off and the fourth control transistor CT4 is turned on
- the second voltage can be written to the input terminal 161 of the touch detection circuit of the pixel circuit.
- a voltage selection circuit 230 provided in Embodiment 2 of the present disclosure can write two voltage signals of different strengths to the input end 161 of the touch detection circuit without setting an AC power source (for example, a voltage source).
- an AC power source for example, a voltage source
- the display panel 10 can be provided with a touch function; by setting the write readout selection circuit 210, The signal line 140 of the pixel circuit can be electrically connected to the data driving circuit 222 or the touch driving circuit 221, thereby enabling the data driving circuit 222 to input a display data signal to the light emitting control circuit of the pixel circuit via the signal line 140 of the pixel circuit.
- the control driving circuit 221 can read the touch electric signal of the touch detection circuit of the pixel circuit via the signal line 140 of the pixel circuit; by setting the voltage selection circuit 230, the touch detection circuit can be used without setting the AC power supply.
- the input terminal 161 writes two signals of different intensities (for example, voltage signals).
- the embodiment provides a driving method of the display panel.
- the driving method of the display panel may include the following steps.
- Step S210 In the display phase EL, a display data signal is input to the light emission control circuit of the pixel circuit via the signal line of the pixel circuit to drive the pixel circuit to emit light.
- Step S220 In the light sensing reading phase R, the touch electric signal of the touch detection circuit of the pixel circuit is read through the signal line of the pixel circuit to determine whether there is a touch action.
- the above steps are not sequential, and it is not required to be accompanied by a light sensing reading phase (touch phase) in each display phase, and for every two or more displays in the case of satisfying the touch time precision.
- the stage sets a light sensing read phase, thereby reducing power consumption.
- FIG. 8 is an exemplary timing diagram of the driving method shown in FIG. 7, and the first transistor T1 shown in FIG. 6 of the second embodiment is located at the first row to the third transistor T3 of the nth row, in the first row.
- the fifth transistor T5 to the nth row and the control terminals of the first control transistor CT1 to the fourth control transistor CT4 are denoted by G1, G31-G3n, G51-G5n, and CG1-CG4, respectively.
- the length of time of the light sensing reading phase R may be equal to one-half or less to one tenth of the length of the display phase EL.
- the display phase EL will be described in detail below with reference to FIGS. 7 and 8.
- the control terminal CG1 of the first control transistor CT1 receives the low level signal
- the control terminal CG2 of the second control transistor CT2 receives the high level signal
- the first control The transistor CT1 is turned on
- the second control transistor CT2 is turned off, whereby the data driving circuit can input the display data signal to the light-emitting control circuit of the pixel circuit via the turned-on first control transistor CT1 and the signal line of the pixel circuit; meanwhile, at the same time,
- the control terminals G51-G5n of the fifth transistor T5 (not shown in FIGS. 7 and 8 and see FIG.
- the control terminals G31-G3n of the third transistor T3 (not shown in FIGS. 7 and 8 and see FIG. 2) located in the first to nth rows receive a high level signal, This third transistor T3 is in an off state.
- the touch detection circuit may include a reset phase RE and a sensing phase SE, and the driving method of the display panel may further include.
- Step S310 In the reset phase RE, write the first voltage to the input end of the touch detection circuit of the pixel circuit.
- Step S320 In the sensing phase SE, write a second voltage to the input end of the touch detection circuit of the pixel circuit, the second voltage being less than the first voltage.
- the control terminal CG3 of the third control transistor CT3 and the control terminal G1 of the first transistor T1 receive the low level signal
- the control terminal CG4 of the fourth control transistor CT4 receives the high level signal
- the third control transistor CT3 and the first transistor T1 are turned on, and the fourth control transistor CT4 is turned off, whereby the first voltage can be written to the input end of the touch detection circuit, and the first voltage is written via the turned-on first transistor T1. Entering the first node in the pixel circuit, the first voltage written causes the second transistor T2 in the touch detection circuit to be in an off state.
- the control terminal CG3 of the third control transistor CT3 and the control terminal G1 of the first transistor T1 receive the high level signal
- the control terminal CG4 of the fourth control transistor CT4 receives the low level signal.
- the third control transistor CT3 and the first transistor T1 are turned off, and the fourth control transistor CT4 is turned on, so that the second voltage can be written to the input terminal of the touch detection circuit. Since the second voltage is less than the first voltage, there is a voltage difference between the first end and the second end of the first transistor T1, so the intensity of the leakage current of the first transistor T1 increases as the intensity of the light incident thereon increases. Further, the voltage of the control terminal of the second transistor T2 decreases as the intensity of the light incident on the first transistor T1 increases.
- the setting manner of the reset phase RE and the sensing phase SE may be set according to specific application requirements, which is not specifically limited in the embodiment of the present disclosure.
- the reset phase RE and the sensing phase SE may be in parallel with the display phase EL, the start time of the reset phase RE may be at the start time of the display phase EL, and the sensing phase SE is located at the display phase EL.
- the period after the reset phase RE, at which time the turn-on time of the sensing phase SE of the pixel circuits located in different rows is the same.
- the time of the start time of the reset phase RE of the pixel circuits of different rows and the time of the start time of the sensing phase SE may be different.
- the pixels may be turned on line by line.
- the light sensing reading phase R will be described in detail below with reference to FIGS. 7 and 8.
- the control terminal CG1 of the first control transistor CT1 receives the high level signal
- the control terminal CG2 of the second control transistor CT2 receives the low level signal
- the first control transistor CT1 is turned off, and the second control transistor CT2 is turned on, so that the touch driving circuit can read the touch detection circuit of the touch detection circuit of the pixel circuit via the signal line of the pixel circuit and the second control transistor CT2 that is turned on.
- the control terminals G31-G3n of the third transistor T3 located in the first to nth rows receive the low-level signal row by row, and thus touch
- the control driving circuit can read the touch electric signal of the pixel circuit row by row, thereby determining whether there is a touch action and a position where the touch action exists.
- the control terminals G51-G5n of the fifth transistor T5 (not shown in FIGS. 7 and 8 and see FIG. 2) located in the first to nth rows are shown. Each receives a high level signal, and therefore, the fifth transistor T5 is in an off state, at which time the display panel does not emit light.
- control terminal G1 of the first transistor T1 and the control terminal CG3 of the third control transistor CT3 may receive a high level signal
- control terminal CG4 of the fourth control transistor CT4 may receive a low level signal, and thus, the first transistor T1 and The third control transistor CT3 is turned off, and the fourth control transistor CT4 is turned on, whereby the second voltage can be written to the input terminal of the touch detection circuit.
- the sensing phase SE can still be set in the display phase EL in the case where the touch detection circuit and the light emission control circuit share the signal line, and thus
- the intensity and the signal-to-noise ratio of the touch electric signal are ensured, that is, the driving method provided by the third embodiment of the present disclosure can use the display with circuit layout optimization.
- the signal-to-noise ratio of the touch electrical signal is guaranteed or improved.
- the embodiment provides a display panel 300.
- the specific structure and process flow of the display panel 300 can be applied to the display panel 10 provided in the second embodiment.
- the display panel 300 includes an array of light emitting regions 310 and a light sensing region 320.
- the structure of the display panel 300 will be described in detail below with reference to FIGS. 9 and 10.
- the arrangement of the light-emitting area 310 and the light-sensing area 320, the area ratio, and the like may be set according to specific application requirements, and the embodiment of the present disclosure does not specifically limit this.
- the light sensitive region 320 may be disposed between two adjacent light emitting regions 310 in the row direction, however, embodiments of the present disclosure are not limited thereto.
- the light sensitive region 320 may also be disposed between two adjacent light emitting regions 310 in the column direction, or between adjacent four light emitting regions 310.
- FIG. 10 is a schematic cross-sectional view along line A-A' of one pixel unit of the display panel 300 shown in FIG.
- one pixel unit of the display panel 300 shown in FIG. 10 may include a photo transistor 361 (for example, the first transistor in the first embodiment), a driving transistor 362 (for example, the fourth transistor in the first embodiment), and a light emitting device. 363 (for example, the light-emitting element in the first embodiment).
- the photo transistor 361 is located in the light sensing region 320
- the driving transistor 362 and the light emitting device 363 are located in the light emitting region 310.
- the photo transistor 361 is a bottom gate type transistor, and may include a first gate metal layer 343, a first gate insulating layer GI1, a semiconductor layer 344, a passivation layer PVX, and a source/drain metal layer 347 which are sequentially disposed.
- the driving transistor 362 is a top gate type transistor, and may include a semiconductor layer 344, a second gate insulating layer GI2, a second gate metal layer 346, a passivation layer PVX, and a source/drain metal layer 347 which are sequentially disposed. .
- the semiconductor layer 344 of the photo transistor 361 and the driving transistor 362, the passivation layer PVX, and the source/drain metal layer 347 can be simultaneously formed, whereby the process flow including the touch function display panel 300 can be simplified.
- the light emitting device 363 may include an anode layer 348, an organic light emitting layer 350, and a cathode layer 351 which are sequentially disposed.
- a flat layer PLN may be disposed between the light emitting device 363 and the driving transistor 362, and an anode of the light emitting device 363 may be electrically connected to a source or a drain of the driving transistor 362 through a via H2 in the flat layer PLN.
- the manufacturing process of the display panel 300 shown in FIG. 10 may include the following steps.
- Step S310 forming a first gate metal layer 343 on the base substrate 341, and forming a gate of the photo transistor 361 by a patterning process (for example, photoresist coating, exposure, development, etching, stripping, etc.) .
- a patterning process for example, photoresist coating, exposure, development, etching, stripping, etc.
- Step S320 forming a first gate insulating layer GI1.
- Step S330 forming a semiconductor layer 344 (for example, depositing an amorphous silicon layer and performing crystallization of amorphous silicon by a low-temperature crystallization process), and forming an active layer pattern of the photo transistor 361 and the driving transistor 362 by a patterning process .
- a semiconductor layer 344 for example, depositing an amorphous silicon layer and performing crystallization of amorphous silicon by a low-temperature crystallization process
- Step S340 forming a second gate insulating layer GI2.
- Step S350 forming a second gate metal layer 346 and forming a gate of the driving transistor 362 by a patterning process.
- Step S360 forming a passivation layer PVX, and forming a via hole H1 in the passivation layer PVX and the second gate insulating layer GI2 by a patterning process to expose a portion of the active layer pattern of the photo transistor 361 and the driving transistor 362.
- Step S370 performing an n-type doping process on the exposed portions of the photo transistor 361 and the driving transistor 362 to obtain an n-type doping region 345.
- Step S380 Forming the source/drain metal layer 347 and forming the source and drain of the photo transistor 361 and the driving transistor 362 by a patterning process.
- Step S390 forming a planarization layer, and forming a via hole H2 in the planarization layer PLN by a patterning process (for example, exposure, development process) to expose a partial region of the source or the drain of the driving transistor 362.
- a patterning process for example, exposure, development process
- Step S391 forming an anode layer 348, which may be electrically connected to a source or a drain of the driving transistor 362 through a via hole in the flat layer PLN, for example, may be patterned by a patterning process such that the anode layer 348 only has the light emitting region 310 Thereby, the photo transistor 361 can be made to sense the intensity of light incident thereon.
- Step S392 forming a pixel defining layer 349.
- Step S393 forming an organic light emitting layer 350.
- Step S394 forming a cathode layer 351 (for example, causing the cathode layer 351 to transmit light).
- the buffer layer 342 may be formed on the base substrate 341, and then the first gate metal layer 343 may be formed.
- the specific properties and forming methods of the respective hierarchical structures of the display panel 300 provided in this embodiment can be referred to the manufacturing process of the organic light emitting display device, and details are not described herein again.
- the display panel 300 shown in FIG. 10 shows only the photo transistor 361, the driving transistor 362, and the light emitting device 363 for the sake of clarity.
- the structure and process flow of the switching transistor of the display panel 300 may be the same as the driving transistor 362 or Part of the same, the specific production process will not be repeated here.
- other necessary components (for example, capacitors) of the display panel 300 may be applied to conventional components, which should be understood by those skilled in the art, and will not be described here, nor should they be used as a pair. Limitations of the invention.
- the fourth embodiment of the present disclosure can implement a display panel including a touch function by using a set of backplane flow-through processes, and can simultaneously form a semiconductor layer, a passivation layer, and a source of the photo transistor, the driving transistor, and the switching transistor.
- the drain metal layer simplifies the process flow of the display panel including the touch function.
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Abstract
Description
Claims (16)
- 一种像素电路,包括:发光元件;发光控制电路,与所述发光元件电连接且配置为驱动所述发光元件发光;触控探测电路,配置为通过感测入射到其上光线的强弱以用于判定是否存在触控动作;以及信号线,配置为与所述发光控制电路的输入端和所述触控探测电路的输出端电连接。
- 根据权利要求1所述的像素电路,其中,所述触控探测电路包括感光元件,所述感光元件配置为将入射到其上的光线转换为感测电信号。
- 根据权利要求2所述的像素电路,其中,所述触控探测电路还包括放大电路,所述放大电路配置为放大所述感光元件输出的感测电信号,以提升所述触控探测电路的触控电信号的信噪比。
- 根据权利要求3所述的像素电路,其中,所述触控探测电路包括第一晶体管、第二晶体管、第三晶体管、第一电容以及第一节点;所述第一晶体管为所述感光元件,且所述第一晶体管的第二端电连接到所述第一节点;所述放大电路包括所述第二晶体管和所述第一电容,所述第二晶体管的控制端电连接到所述第一节点,所述第二晶体管的第一端电连接到所述第三晶体管的第一端,所述第二晶体管的第二端电连接到所述第一电容的第二端;所述第一电容的第一端电连接到所述第一节点;以及所述第三晶体管的第二端电连接到所述信号线。
- 根据权利要求1-4任一所述的像素电路,其中,所述发光控制电路包括:发光驱动电路,配置为可驱动所述发光元件发光;发光选择电路,配置为可选择地将数据信号写入到所述发光驱动电路的控制端;以及第二电容,配置为存储所述数据信号并将其保持在所述发光驱动电路的控制端。
- 根据权利要求5所述的像素电路,其中,所述发光控制电路还包括第二节点;所述发光驱动电路包括第四晶体管,所述第四晶体管的控制端电连接到所述第二节点,所述第四晶体管的第一端电连接到所述发光元件的第二端,所述第四晶体管的第二端配置为电连接到第一电源端;所述发光选择电路包括第五晶体管,所述第五晶体管的第一端电连接到所述信号线的第一端,所述第五晶体管的第二端电连接到所述第二节点;所述第二电容的第一端电连接到所述第二节点,所述第二电容的第二端电连接到所述第四晶体管的第二端;以及所述发光元件的第一端电连接到第二电源端。
- 根据权利要求1-3任一所述的像素电路,其中,所述触控探测电路包括第一晶体管,所述发光控制电路包括第四晶体管,所述第一晶体管为底栅型晶体管,所述第四晶体管为顶栅型晶体管,所述第一晶体管和所述第四晶体管的有源层同层形成。
- 一种显示面板,包括:阵列排列的像素单元和写入读出选择电路;以及至少一个所述像素单元包括如权利要求1-7任一所述的像素电路;其中,所述写入读出选择电路包括第一端、第二端以及第三端,所述第三端电连接到所述像素电路的信号线,所述第一端可电连接至数据驱动电路,所述第二端可电连接至触控驱动电路;所述写入读出选择电路配置为可将所述第一端与所述第三端电连接或将所述第二端和所述第三端电连接。
- 根据权利要求8所述的显示面板,其中,所述写入读出选择电路配置为:在显示阶段将所述第一端与所述第三端电连接,以经由所述像素电路的信号线向所述像素电路的发光控制电路输入显示数据信号;以及在光感读取阶段将所述第二端和所述第三端电连接,以经由所述像素电 路的信号线读取所述像素电路的触控探测电路的触控电信号。
- 根据权利要求8或9所述的显示面板,其中,所述写入读出选择电路包括第一控制晶体管和第二控制晶体管;所述第一控制晶体管的第一端电连接到所述像素电路的信号线,所述第一控制晶体管的第二端配置为可电连接到数据驱动电路;所述第二控制晶体管的第一端电连接到所述像素电路的信号线,所述第二控制晶体管的第二端配置为可电连接到触控驱动电路。
- 根据权利要求10所述的显示面板,还包括触控驱动电路和数据驱动电路,其中,所述第一控制晶体管的第二端电连接到数据驱动电路;所述第二控制晶体管的第二端电连接到触控驱动电路。
- 根据权利要求8-11任一所述的显示面板,还包括电压选择电路,其中,所述电压选择电路配置为将所述像素电路的触控探测电路的输入端电连接到第一输入电源或第二输入电源。
- 根据权利要求12所述的显示面板,其中,所述电压选择电路包括第三控制晶体管和第四控制晶体管;所述第三控制晶体管的第一端电连接到所述像素电路的触控探测电路的输入端,所述第三控制晶体管的第二端配置为可电连接到所述第一输入电源;所述第四控制晶体管的第一端电连接到所述像素电路的触控探测电路的输入端,所述第四控制晶体管的第二端配置为可电连接到所述第二输入电源。
- 根据权利要求8-13任一所述的显示面板,其中,至少一列所述像素单元均包括如权利要求1-7任一所述的像素电路且共用同一信号线。
- 一种如权利要求8-14任一所述的显示面板的驱动方法,包括:在显示阶段,经由所述像素电路的信号线向所述像素电路的发光控制电路输入显示数据信号,以驱动所述像素电路发光;在光感读取阶段,经由所述像素电路的信号线读取所述像素电路的触控探测电路的触控电信号,以判定是否存在触控动作。
- 根据权利要求15所述的显示面板的驱动方法,所述显示阶段包括复位阶段和感测阶段,所述驱动方法还包括:在所述复位阶段,向所述像素电路的触控探测电路的输入端写入第一电压;以及在所述感测阶段,向所述像素电路的触控探测电路的输入端写入第二电压,其中所述第二电压小于所述第一电压。
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CN109388273B (zh) * | 2017-08-14 | 2020-10-30 | 京东方科技集团股份有限公司 | 触控显示面板及其驱动方法、电子装置 |
CN108682392A (zh) * | 2018-05-21 | 2018-10-19 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示面板、制作方法和显示装置 |
CN108646949B (zh) | 2018-06-04 | 2024-03-19 | 京东方科技集团股份有限公司 | 光电检测电路及方法、阵列基板、显示面板、指纹识别法 |
CN109192071B (zh) * | 2018-10-16 | 2021-03-23 | 京东方科技集团股份有限公司 | 显示面板及其形变感应方法、显示装置 |
CN109523954B (zh) * | 2018-12-24 | 2020-12-22 | 合肥鑫晟光电科技有限公司 | 像素单元、显示面板、驱动方法以及补偿控制方法 |
CN109686301B (zh) * | 2019-02-28 | 2020-10-16 | 厦门天马微电子有限公司 | 光感电路及其驱动方法、显示面板和显示装置 |
KR20210059075A (ko) * | 2019-11-13 | 2021-05-25 | 삼성디스플레이 주식회사 | 표시 장치 |
CN111863892B (zh) * | 2020-07-13 | 2022-08-23 | 武汉华星光电半导体显示技术有限公司 | 显示装置及其制备方法 |
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CN113467642A (zh) * | 2021-07-05 | 2021-10-01 | 深圳市华星光电半导体显示技术有限公司 | 光触控检测电路和光触控显示面板 |
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